Jeff Thompson | a28eed8 | 2013-08-22 16:21:10 -0700 | [diff] [blame] | 1 | |
| 2 | #ifndef BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED |
| 3 | #define BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED |
| 4 | |
| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
| 6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. |
| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
| 10 | // |
| 11 | // See http://www.boost.org/libs/mpl for documentation. |
| 12 | |
| 13 | // $Id: O1_size_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
| 14 | // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $ |
| 15 | // $Revision: 49267 $ |
| 16 | |
| 17 | #include <ndnboost/mpl/O1_size_fwd.hpp> |
| 18 | #include <ndnboost/mpl/long.hpp> |
| 19 | #include <ndnboost/mpl/if.hpp> |
| 20 | #include <ndnboost/mpl/aux_/has_size.hpp> |
| 21 | #include <ndnboost/mpl/aux_/config/forwarding.hpp> |
| 22 | #include <ndnboost/mpl/aux_/config/static_constant.hpp> |
| 23 | #include <ndnboost/mpl/aux_/config/msvc.hpp> |
| 24 | #include <ndnboost/mpl/aux_/config/workaround.hpp> |
| 25 | |
| 26 | namespace ndnboost { namespace mpl { |
| 27 | |
| 28 | // default implementation - returns 'Sequence::size' if sequence has a 'size' |
| 29 | // member, and -1 otherwise; conrete sequences might override it by |
| 30 | // specializing either the 'O1_size_impl' or the primary 'O1_size' template |
| 31 | |
| 32 | # if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \ |
| 33 | && !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) |
| 34 | |
| 35 | namespace aux { |
| 36 | template< typename Sequence > struct O1_size_impl |
| 37 | : Sequence::size |
| 38 | { |
| 39 | }; |
| 40 | } |
| 41 | |
| 42 | template< typename Tag > |
| 43 | struct O1_size_impl |
| 44 | { |
| 45 | template< typename Sequence > struct apply |
| 46 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) |
| 47 | : if_< |
| 48 | aux::has_size<Sequence> |
| 49 | , aux::O1_size_impl<Sequence> |
| 50 | , long_<-1> |
| 51 | >::type |
| 52 | { |
| 53 | #else |
| 54 | { |
| 55 | typedef typename if_< |
| 56 | aux::has_size<Sequence> |
| 57 | , aux::O1_size_impl<Sequence> |
| 58 | , long_<-1> |
| 59 | >::type type; |
| 60 | |
| 61 | BOOST_STATIC_CONSTANT(long, value = |
| 62 | (if_< |
| 63 | aux::has_size<Sequence> |
| 64 | , aux::O1_size_impl<Sequence> |
| 65 | , long_<-1> |
| 66 | >::type::value) |
| 67 | ); |
| 68 | #endif |
| 69 | }; |
| 70 | }; |
| 71 | |
| 72 | # else // BOOST_MSVC |
| 73 | |
| 74 | template< typename Tag > |
| 75 | struct O1_size_impl |
| 76 | { |
| 77 | template< typename Sequence > struct apply |
| 78 | : long_<-1> |
| 79 | { |
| 80 | }; |
| 81 | }; |
| 82 | |
| 83 | # endif |
| 84 | |
| 85 | }} |
| 86 | |
| 87 | #endif // BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED |